The Supreme Court has unanimously rejected Texas' claim that it has a right under a 30-year-old agreement to cross the border with Oklahoma for water to serve the fast-growing Fort Worth area.

The justices on Thursday upheld a lower court ruling that said Oklahoma laws intended to block Texas' water claims are valid.

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The case concerns a dispute over access to southeastern Oklahoma tributaries of the Red River that separates Oklahoma and Texas.

The Tarrant Regional Water District, which serves an 11-county area in north-central Texas including Fort Worth and Arlington, wants to buy 150 billion gallons of water and says the four-state Red River Compact gives it the right to do so. Arkansas and Louisiana are the other participating states and they are siding with Oklahoma.

"Today's ruling is great news for the state of Oklahoma and yet another victory in the effort to protect our state's water resources. We've maintained all along that Oklahoma must have the ability to set its own water policy and today's unanimous Supreme Court decision solidifies that position. My congratulations go out to Attorney General Scott Pruitt and his office for their great work in this case on behalf of the state," said Oklahoma Gov. Mary Fallin.

"This is a major victory for Oklahoma with all nine justices agreeing with our argument that Texas does not have the right to come into Oklahoma and take our water,” Oklahoma Attorney General Scott Pruitt said. “We successfully defended Oklahoma’s right to protect its natural resources at the district court, circuit court of appeals, and now the Supreme Court, which confirmed Oklahoma’s sovereignty over its water resources. This unanimous decision will affect all western states governed by multistate water compacts, and will protect Oklahoma’s ability to control this vital resource for generations to come.”